Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef
Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.
CVE-2026-65601
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-65601
traefik
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "traefik",
"product": "traefik",
"versions": [
{
"status": "affected",
"version": "3.7.0",
"lessThan": "3.7.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "3.7.7",
"versionType": "semver"
}
],
"packageURL": "pkg:golang/github.com/traefik/traefik/v3",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-65601
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12994 · Revision 1
- Added to Heist Feed
- Publisher date